Sex-linked: if x and y are regular chromosomes they can make mistakes too. They reside on the X chromosome. Color blindness, duchenne muscular dystrophy, hemophilia. Found more in men. Ex) woman who’s a carrier for hemophilia, marries a hemophilic. Probability of child having it? Son with it? Daughter with it? 50%, 50%, 50% …………muscular dystrophy:weakening of muscles and loss of coordination hemophilia: missing 1 or more prots required to clot blood.